When South Korea started tackling this problem 20 years ago, it threw away 98 percent of its food waste. Today, 98 percent of food waste is turned into feed, compost or energy, according to the South Korean Ministry of Environment. It achieved this by banning food scraps from landfills and mandating that all residents separate their food waste from their trash and recycling — and to pay for the service through fees and fines.

South Korea is one of the few countries with a nationwide system for food-waste management. While France made composting food mandatory this year — and some cities like New York have imposed similar rules — few places match up with South Korea.